<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Untitled Document</title>
</head>

<body>

<form name="form" method="get" action="aula14.php">
<input type="text" name="valor" /><br/><input type="submit" value="Enviar" />
</form>

<br />

<!-- O Valor é <?= $_POST['valor']; ?> -->


O valor é: <?= $_GET['valor']?>


</body>
</html>